Take-off mechanism for tube machines



Sept. 4, 1934. l P'. WITTE I 1,972,121

TAKE-OFF MECHANISM 'FOR TUBE MACHINES Filed Aug. 18, 1933 3 Sheets-Sheetl INVENTOR LWELF ATTORN EYJ Sept; 4, 1934. P. WlTTE I TAKE-OFF MECHANISMFORTUBE MACHINES Filed Aug. 18

1935 3 Sheets-Sheet 3 mill INVENTOR jg L 71/; T7252 F M ATTORNEYS iatented Sept. 4, 1934 TAKE-OFF MECHANISM FOR TUBE I MACHINES Paul Witte,New Milford, N. J., assignor to White Metal 'Manufacturing Company, 1Hoboken; N. J., a corporation of New Jersey Application- August 18,1933;Serial'No. 685,675 Claims. .(01. 207- 9) This invention relates broadlyto tube makingmachines and more specifically to improvements in meansfor stripping tubes from the punch member thereof. It is broadly old'toprovide tube 5 machines consisting of a reciprocating punch carried by alaterally swingable 'arm, said punch being adapted to coact with the dieso that upon the downward movement of the pimchit engages a disc or slugwithin the die and by extrusion forms a tube of block tin or similarductile metal on the punch. Various forms of stripping devices have beenpreviously-devised for removing the tubes from the punch. But these havebeen detailed, complex mechanisms which frequently get out of orderbecause of the rapid rate at provides a greatly simplified constructionof strip per device. h v i g The invention will be fully apparent fromthe following specification when read in connection with theaccompanying drawings and'will be defined with particularity in theappended claims. In the drawings, Fig. 1 is a front view of a punchpress equipped with my improved form of tube take-off mechanism; Fig. 2is an enlarged perspective view of the take-off mechanism and related 3parts; Fig. 3 is a horizontal section on line 3-3 of Fig. 1; Fig. 4 is adetailed plan view of a supporting head and stripper sleeve; Fig. 5 is aface view of Fig 4. with parts shown in section in the interest ofclearness; and Fig. 6 is a detailed section on line 6-6 of Fig. 4.

Referring in detail to the drawings, 10 represents the frame of aconventional form of punch press having a main drive shaft 12 whichthrough drive pinion 14 and gear 16 rotates a crank shaft 18 carryingcrank arms 20 to the crank pin 22 to which there is connected a pitman24. This pitman is operatively connected with a cross head 26 whichslides vertically between suitable guides 28. The verticallyreciprocating cross head car- '45 ries a horizontally swingable arm 30to the outer end of which there is secured a punch 32. This punch coactswith the die 34 so as to form tubes from slugs or discs S fed to the dieby suitable feed mechanism from a chute 0. As the punch descends itstrikes one of the discs. This results in the forming operation by aprocess of extrusion and thus forms a tube, as indicated at T in Fig. l,which surrounds the plunger.

As the punch 32 ascends the arm 30 is swung outwardly to permit removalof the tube. The

machine thus far briefly described is of c-onventional type and myinvention relates specifically to improvements in the means for removingthe tube Tfrom the punch 32. Secured to the frame of the machine Iprovide a fixed support 36 which in the embodiment illustrated is in theform of a vertical rod screwed into the bed of the ma-' chine and lockedby a nut 38. Slidable on the support there is a head 40 which carries asleeve indicated generally at 42. I'his sleeve is formed of twocomplementary parts 44 and 46 each of g which is provided withshouldered enlargements 48 so as to form an annular groove 50 forengagement with the annular projection 52 formed in the head. The parts44 and 46 of the sleeve are held in place by a keeper 54 which issecured to the head by a screw 56 as clearly shown in Figs. 4 and 5. Forholding the two parts of the split sleeve in proper relationship withone another I preferably employ set screws 58 and 60 as indicatedin'Fig. 6. Springs 61 are preferably inserted between theaends'of thescrews 58 and 60 and the parts 44 and 46 so as to provide a resilientpressure of the parts against the punch 32.

The head 40 has a downwardly extending hub 30 portion 62, the wall ofwhich is separated to form a cam slot 64. A block 66 is provided whichmakes asliding fit with the cam slot, said block being swiveled on astud bolt 68 screwed to the fixed support 36. With parts thus arrangedit is 35 apparent that when the swinging arm 30 moves upwardly andswings outwardly that because the sleeve held by the head 40 embracesthe punch the swinging movement will also be applied to the head. Thisswinging movement of the head may, because of thecam and pin connectionbetween the head and the fixed support, cause a movement of the sleeverelatively to the punch. This movement is downward and therefore isefiective to strip the tube T from the punch. In short, the swingingmovement of the punch is transformed into an endwise movement of thehead and the stripping sleeve. In this waythe endwise movement securedis much greater than that which would result merely from thereciprocation of the punch alone. The reciprocating movement of thepunch alone is less than the length of the tube. Thus by providing meansfor transforming the swinging movement of the punch I secure sufficientmovement to enable the tube to be properly stripped from the die. Itmight be thought that the same result could be secured merely byincreasing the stroke of the punch and the stroke of the crank shaft.But such procedure would be impractical because the pro er formation ofthe tube requires only a very short stroke of the punch. Moreover, thepunches themselves are massive machines which cannot be greatly modifiedwithout going to great expense. They can also be operated much moreefficiently at a high speed when employing a small punch stroke.

For receiving the tubes as they are stripped from the punch I provide ahopper 70, which has a substantially vertical portion '72 and'a'downwardly inclined portion '74, the vertical portion being cut awayas indicated at '76 in order to permit the punch to swing into properdischarge position prior to the stripping of the tube therefrom.

While I have described quite specifically the particular embodiments ofthe present invention herein illustrated it is to be understood thatvarious modifications and substitutions and equivalents may be made bythose skilled in the and pin connection between the support and the headfor causing the sleeve to move relatively v to the punch upon theswinging movement of the latter so as to stripthe tube from the punch.

.2. In a machine for making collapsible tubes having a fixed, die and avertically reciprocating punch carried. by a horizontally swinging arm,

a stripper mechanism for removing tubes from the punch comprising asleeve embracing the punch,v a vertically movable head to which saidsleeve is secured, a fixed upright for guiding said head and a pinsecured to said upright and coacting. with a cam slot formed in a hubvon said head whereby the swinging movement of the punch imparts alongitudinal sliding movement of said sleeve relatively to the uprightand the punch so as to strip the tube from the latter.

3. In a machine for making collapsible tubes having a fixed die and areciprocating punch carried by a swingable arm, a stripper mechanism forremoving tubes from thepunch comprising a sleeve embracing the punch, asupporting head therefor slidable on a fixed upright rod, and a hub onsaid head having a cam groove coacting with a block swivelled on saidrod and effective to cause the sleeve to move lengthwise of said punchupon swinging movement of the punch so as to strip the tube therefrom.

4. In amachine for making collapsible tubes having a fixeddie and areciprocating punch carried by a swingable arm, a stripper mechanism forremoving tubes from the punch comprising a sleeve embracing the punch, asupporting head therefor slidable on a fixed support, and coacting meansbetween said head and said support efiective to cause the sleeve to movelengthwise of said punch upon swinging movement of the. punch so as tostrip the tube therefrom and a receiving hopper located in the path ofthe swinging movement of said punch and having a cut away portion topermit the entrance therein of the punch.- 4 A 5v. Ina machine formaking collapsible tubes having, a fixed die and a reciprocating punchcarried by a swingable arm,;a stripper mechanism for removingtubes fromthe punch comprising a sleeve embracing the punch, a supporting headtherefor slidable on a fixed upright and coacting means betweenisaidhead and saidsupport effective to cause the sleeve to move lengthwise ofsaid punch uponswinging movement of the punch so as to strip the tubetherefrom, said sleeve being formed of complementary pieces and a keeperslidably mounted in said head for removably securing'said pieces to thehead.

PAUL WITTE.

